<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      * {
        margin: 0;
        padding: 0;
      }
      ul,
      li {
        list-style: none;
      }
      ul {
        width: 300px;
        height: 500px;
        border: 1px solid red;
        margin: 30px auto;
        overflow-y: scroll;
      }
      ul li {
        text-align: center;
        height: 50px;
        line-height: 50px;
        border: 1px solid #ccc;
        background: #fff;
      }
      .sticky {
        position: sticky;
        top: 0;
      }
    </style>
  </head>
  <body>
    <div style="overflow: hidden">
      <ul>
        <li>1</li>
        <li>2</li>
        <li class="sticky">3</li>
        <li>4</li>
        <li>5</li>
        <li>6</li>
        <li>7</li>
        <li>8</li>
        <li>9</li>
        <li>10</li>
        <li>11</li>
        <li>12</li>
        <li>13</li>
        <li>14</li>
        <li>15</li>
      </ul>
    </div>
  </body>
</html>
